CN109027148B - Six-speed automatic transmission for pure electric commercial vehicle - Google Patents

Abstract

The invention provides a six-speed automatic transmission for a pure electric commercial vehicle, which comprises a front two-speed compound planetary transmission device, a rear three-speed compound planetary transmission device and at least five groups of gear shifting modules; the front two-speed compound planetary transmission device and the rear three-speed compound planetary transmission device are sequentially and coaxially connected; the gear shifting module comprises a gear shifting gear, a gear shifting shaft, a gear shifting disc and a gear shifter; the gear shifting module is meshed with each gear control part of the corresponding front two-speed compound planetary transmission device and the corresponding rear three-speed compound planetary transmission device through a gear shifting gear. The modularized planetary transmission device and the novel gear shifting module adopted by the invention have the advantages of simple structure, high transmission efficiency, no power interruption gear shifting, low vibration noise, high reliability, easy intelligent control and the like, and are particularly suitable for a transmission system of a pure electric commercial vehicle.

Description

Six-speed automatic transmission for pure electric commercial vehicle

Technical Field

The invention relates to the field of speed changers, in particular to a six-speed automatic speed changer for a pure electric commercial vehicle.

Background

With the increasing severity of environmental pollution and energy problems, all countries in the world have planned the development strategy of new energy automobiles, and automobile enterprises are also actively developing energy-saving and environment-friendly automobiles, mainly pure electric automobiles and plug-in hybrid electric automobiles. With the rapid development of the fields of short-distance passenger transport and logistics, pure electric commercial vehicles attach more and more importance to pure electric driving capability, so that the multi-gear running of the pure electric commercial vehicles becomes the core research and development content of the power assembly of the pure electric commercial vehicles.

To ensure safe, efficient and stable driving on bad road conditions and on some special road conditions, commercial vehicles have mostly employed internal combustion engine + multi-speed transmission drive schemes for decades. However, based on energy-saving, environment-friendly and intelligent driving, the traditional fuel oil commercial vehicle has difficulty in meeting the requirements of a new-generation commercial vehicle due to the large fuel consumption and poor emission. If a motor direct drive or a fewer gear gearbox drive is used, the motor volume and weight will be very large. Therefore, there is an urgent need for a high-efficiency high-reliability multi-speed automatic transmission that matches high-speed and lightweight electric utility vehicles.

Disclosure of Invention

The invention provides a six-speed automatic transmission for a pure electric commercial vehicle, which solves the problems in the prior art.

The technical scheme of the invention is realized as follows:

the six-speed automatic transmission for the pure electric commercial vehicle consists of a front two-speed compound planetary transmission device, a rear three-speed compound planetary transmission device and five groups of gear shifting modules, wherein the front two-speed compound planetary transmission device and the rear three-speed compound planetary transmission device are sequentially and coaxially connected, and the gear shifting modules consist of gear shifting gears, gear shifting shafts, gear shifting discs and gear shifters; the front two-speed compound planetary transmission device consists of a first sun gear, a first planet gear, a first gear ring, a first rotating arm, a second planet gear, a second gear ring and a second rotating arm, wherein the first sun gear is externally meshed with the first planet gear; the second planet wheel is externally meshed with the outer gear ring of the first gear ring, the second gear ring is only provided with an inner gear ring, the second planet wheel is internally meshed with the second gear ring, and the second planet wheel is arranged on the second rotating arm.

The input shaft is fixedly connected with the first sun gear, the first rotating arm is fixedly connected with the second gear ring through a connecting disc, and the connecting disc is fixedly connected with the intermediate shaft; the two first gear shifting gears are symmetrically arranged on the outer circumference of the first gear ring, the first gear shifting gears are externally meshed with the outer gear ring of the first gear ring, the first gear shifting gears are fixedly connected with a first gear shifting disc through a first gear shifting shaft, and the first gear shifting disc is arranged between left and right friction blocks of the first gear shifter according to a certain gap; the second rotating arm is provided with a second rotating arm gear in a machining mode, two second gear shifting gears are symmetrically arranged on the outer circumference of the second rotating arm gear, the second gear shifting gears are meshed with the second rotating arm gear, the second gear shifting gears are fixedly connected with a second gear shifting disc through second gear shifting shafts, and the second gear shifting disc is arranged between left and right friction blocks of a second gear shifter according to a certain gap.

The rear three-speed compound planetary transmission device consists of a third sun gear, a third planet gear, a third gear ring, a third rotating arm, a fourth sun gear, a fourth planet gear, a fourth gear ring, a fourth rotating arm, a fifth sun gear, a fifth planet gear, a fifth gear ring and a fifth rotating arm, wherein the third sun gear is externally meshed with the third planet gear, an inner gear ring and an outer gear ring are simultaneously processed on the inner circumference and the outer circumference of the third gear ring, the third planet gear is internally meshed with the inner gear ring of the third gear ring, and the third planet gear is arranged on the third rotating arm; the fourth sun gear is externally meshed with a fourth planetary gear, an inner gear ring and an outer gear ring are simultaneously processed on the inner circumference and the outer circumference of the fourth gear ring, the fourth planetary gear is internally meshed with the inner gear ring of the fourth gear ring, and the fourth planetary gear is arranged on a fourth rotating arm; the fifth sun gear is externally meshed with the fifth planet gear, the inner gear ring and the outer gear ring are simultaneously processed on the inner circumference and the outer circumference of the fifth gear ring, the fifth planet gear is internally meshed with the inner gear ring of the fifth gear ring, and the fifth planet gear is arranged on the fifth rotating arm.

The third sun gear and the fourth rotating arm are sequentially and fixedly arranged on the intermediate shaft; the third rotating arm is fixedly connected with the fourth gear ring and the fifth rotating arm in sequence; the fourth sun gear and the fifth sun gear are sequentially and fixedly connected with the output shaft; the two third gear shifting gears are symmetrically arranged on the outer circumference of the third gear ring, the third gear shifting gears are externally meshed with the outer gear ring of the third gear ring, the third gear shifting gears are fixedly connected with a third gear shifting disc through third gear shifting shafts, and the third gear shifting disc is arranged between left and right friction blocks of a third gear shifter according to a certain gap; the two fourth gear shifting gears are symmetrically arranged on the outer circumference of the fourth gear ring, the fourth gear shifting gears are externally meshed with the outer gear ring of the fourth gear ring, the fourth gear shifting gears are fixedly connected with a fourth gear shifting disc through fourth gear shifting shafts, and the fourth gear shifting disc is arranged between left and right friction blocks of a fourth gear shifter according to a certain gap; the two fifth gear shifting gears are symmetrically distributed on the outer circumference of the fifth gear ring, the fifth gear shifting gears are externally meshed with the outer gear ring of the fifth gear ring, the fifth gear shifting gears are fixedly connected with a fifth gear shifting disc through fifth gear shifting shafts, and the fifth gear shifting disc is arranged between left and right friction blocks of the fifth gear shifter according to a certain gap.

I gear drive mode: when the first gear shifter, the fourth gear shifter and the fifth gear shifter are released, the second gear shifter and the third gear shifter are closed, namely, the first gear shifting disc, the fourth gear shifting disc and the fifth gear shifting disc are in a free rotation state, the second gear shifting disc and the third gear shifting disc are in a braked state, then, the first gear ring, the fourth gear ring and the fifth gear ring are in a free rotation state, the second rotating arm and the third gear ring are in a locking state, and the six-speed automatic transmission for the pure electric commercial vehicle is in an I gear driving mode.

II gear drive mode: when the second gear shifter, the fourth gear shifter and the fifth gear shifter are released, the first gear shifter and the third gear shifter are closed, namely, the second gear shifting disc, the fourth gear shifting disc and the fifth gear shifting disc are in a free rotation state, and the first gear shifting disc and the third gear shifting disc are in a braked state, further, the second rotating arm, the fourth gear ring and the fifth gear ring are in a free rotation state, the first gear ring and the third gear ring are in a locking state, and the six-speed automatic transmission for the pure electric commercial vehicle is in a II-gear driving mode.

III drive mode: when the first gear shifter, the third gear shifter and the fourth gear shifter are released, the second gear shifter and the fifth gear shifter are closed, namely, the first gear shifting disc, the third gear shifting disc and the fourth gear shifting disc are in a free rotation state, the second gear shifting disc and the fifth gear shifting disc are in a braked state, then, the first gear ring, the third gear ring and the fourth gear ring are in a free rotation state, the second rotating arm and the fifth gear ring are in a locking state, and the six-speed automatic transmission for the pure electric commercial vehicle is in a III gear driving mode.

IV gear drive mode: when the second gear shifter, the third gear shifter and the fourth gear shifter are released, the first gear shifter and the fifth gear shifter are closed, namely, the second gear shifting disc, the third gear shifting disc and the fourth gear shifting disc are in a free rotation state, and the first gear shifting disc and the fifth gear shifting disc are in a braked state, further, the second rotating arm, the third gear ring and the fourth gear ring are in a free rotation state, the first gear ring and the fifth gear ring are in a locking state, and the six-speed automatic transmission for the pure electric commercial vehicle is in an IV gear driving mode.

V gear drive mode: when the first gear shifter, the third gear shifter and the fifth gear shifter are released, the second gear shifter and the fourth gear shifter are closed, namely, the first gear shifting disc, the third gear shifting disc and the fifth gear shifting disc are in a free rotation state, the second gear shifting disc and the fourth gear shifting disc are in a braked state, then, the first gear ring, the third gear ring and the fifth gear ring are in a free rotation state, the second rotating arm and the fourth gear ring are in a locking state, and the six-speed automatic transmission for the pure electric commercial vehicle is in a V gear driving mode.

VI range drive mode: when the second gear shifter, the third gear shifter and the fifth gear shifter are released, the first gear shifter and the fourth gear shifter are closed, namely, the second gear shifting disc, the third gear shifting disc and the fifth gear shifting disc are in a free rotation state, and the first gear shifting disc and the fourth gear shifting disc are in a braked state, further, the second rotating arm, the third gear ring and the fifth gear ring are in a free rotation state, the first gear ring and the fourth gear ring are in a locking state, and the six-speed automatic transmission for the pure electric commercial vehicle is in a VI gear driving mode.

The beneficial effects are that:

the six-speed automatic transmission for the pure electric commercial vehicle comprises a front two-speed compound planetary transmission device, a rear three-speed compound planetary transmission device and at least five groups of two-group gear shifting modules; the front two-speed compound planetary transmission device and the rear three-speed compound planetary transmission device are sequentially and coaxially connected; the gear shifting module comprises a gear shifting gear, a gear shifting shaft, a gear shifting disc and a gear shifter; the gear shifting module is meshed with each gear control part of the corresponding front two-speed compound planetary transmission device and the corresponding rear three-speed compound planetary transmission device through a gear shifting gear.

The invention provides a six-speed automatic transmission for a pure electric commercial vehicle, which consists of a front two-speed compound planetary transmission device, a rear three-speed compound planetary transmission device and five groups of gear shifting modules; in addition, six gear driving modes are realized by selecting the closing and releasing of the two groups of gear shifting modules of the front two-speed compound planetary transmission device and the three groups of gear shifting modules of the rear three-speed compound planetary transmission device. The modularized planetary transmission device and the novel gear shifting module adopted by the invention have the advantages of simple structure, high transmission efficiency, no power interruption gear shifting, low vibration noise, high reliability, easy intelligent control and the like, and are particularly suitable for a transmission system of a pure electric commercial vehicle.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic diagram of a connection structure according to the present invention.

In the figure, an input shaft 1; a first sun gear 2; a first planet 3; a first rotating arm 4; a first ring gear 5; a second planet wheel 6; a second rotating arm 7; a second ring gear 8; a second boom gear 9; a first shift gear 10; a first shift shaft 11; a first shift plate 12; a first shifter 13; a second gear 14; a second shift shaft 15; a second shift plate 16; a second shifter 17; a land 18; an intermediate shaft 19; a third sun gear 20; a third planetary gear 21; a third gear 22; a third shift gear 23; a third shift shaft 24; a third shift plate 25; a third shifter 26; a third rotating arm 27; a fourth ring gear 28; a fourth planetary gear 29; a fourth swivel arm 30; a fourth sun gear 31; a fourth shift gear 32; a fourth shift shaft 33; a fourth shift plate 34; a fourth shifter 35; a fifth swivel arm 36; a fifth sun gear 37; a fifth planet 38; a fifth ring gear 39; an output shaft 40; a fifth shift gear 41; a fifth shift shaft 42; a fifth shift plate 43; a fifth shifter 44.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1, an input shaft 1 is fixedly connected with a first sun gear 2, the first sun gear 2 is externally meshed with a first planet gear 3, the first planet gear 3 is arranged on a first rotating arm 4, an inner gear ring and an outer gear ring are simultaneously processed on the inner circumference and the outer circumference of a first gear ring 5, and the first planet gear 3 is internally meshed with the inner gear ring of the first gear ring 5; the two first gear shifting gears 10 are symmetrically distributed on the outer circumference of the first gear ring 5, the first gear shifting gear ring 10 is externally meshed with the outer gear ring of the first gear ring 5, the first gear shifting gears 10 are fixedly connected with a first gear shifting disc 12 through a first gear shifting shaft 11, and the first gear shifting disc 12 is arranged between left and right friction blocks of a first gear shifter 13 at a certain gap; the gear shifter consists of a gear shifting driving motor, a speed reducing unit, a control unit and left and right friction blocks; the outer gear ring of the first gear ring 5 is externally meshed with the second planetary gear 6, the second planetary gear 6 is arranged on the second rotating arm 7, the second gear ring 8 is only provided with an inner gear ring, and the second planetary gear 6 is internally meshed with the second gear ring 8; the second rotating arm 7 is provided with a second rotating arm gear 9, two second gear shifting gears 14 are symmetrically arranged on the outer circumference of the second rotating arm gear 9, the second gear shifting gears 14 are externally meshed with the second rotating arm gear 9, the second gear shifting gears 14 are fixedly connected with a second gear shifting disc 16 through a second gear shifting shaft 15, and the second gear shifting disc 16 is arranged between left and right friction blocks of a second gear shifter 17 at a certain gap; the first rotating arm 4 and the second gear ring 8 are fixedly arranged on a connecting disc 18 together, and the connecting disc 18 is fixedly connected with an intermediate shaft 19; the third sun gear 20 and the fourth rotating arm 30 are sequentially and fixedly arranged on the intermediate shaft 19, the third sun gear 20 is externally meshed with the third planet gears 21, and the third planet gears 21 are arranged on the third rotating arm 27; the inner gear ring and the outer gear ring are simultaneously processed on the inner circumference and the outer circumference of the third gear ring 22, and the third planet gears 21 are internally meshed with the inner gear ring of the third gear ring 22; the two third gear shifting gears 23 are symmetrically distributed on the outer circumference of the third gear ring 22, the third gear shifting gears 23 are externally meshed with the outer gear ring of the third gear ring 22, the third gear shifting gears 23 are fixedly connected with a third gear shifting disc 25 through a third gear shifting shaft 24, and the third gear shifting disc 25 is arranged between left and right friction blocks of a third gear shifter 26 at a certain interval; the third rotating arm 27 is fixedly connected with the fourth gear ring 28 and the fifth rotating arm 36 in turn; the fourth sun gear 31 is externally meshed with the fourth planet gear 29, the fourth planet gear 29 is arranged on the fourth rotating arm 30, an inner gear ring and an outer gear ring are simultaneously processed on the inner circumference and the outer circumference of the fourth gear ring 28, the fourth planet gear 29 is internally meshed with the inner gear ring of the fourth gear ring 28, two fourth gear shifting gears 32 are symmetrically distributed on the outer circumference of the fourth gear ring 28, the fourth gear shifting gears 32 are fixedly connected with a fourth gear shifting disc 34 through a fourth gear shifting shaft 33, and the fourth gear shifting disc 34 is pressed between left and right friction blocks of a fourth gear shifter 35 according to a certain gap; the fourth sun gear 31 and the fifth sun gear 37 are sequentially and fixedly installed on the output shaft 40, the fifth sun gear 37 is externally meshed with the fifth planet gears 38, the fifth planet gears 38 are installed on the fifth rotating arm 36, an inner gear ring and an outer gear ring are simultaneously machined on the inner circumference and the outer circumference of the fifth gear ring 39, the fifth planet gears 38 are internally meshed with the inner gear ring of the fifth gear ring 39, two fifth gear shifting gears 41 are symmetrically distributed on the outer circumference of the fifth gear ring 39, the fifth gear shifting gears 41 are fixedly connected with the fifth gear shifting disc 43 through a fifth gear shifting shaft 42, and the fifth gear shifting disc 43 is installed between left friction blocks and right friction blocks of the fifth gear shifter 44 according to a certain gap.

The invention provides a six-speed automatic transmission for a pure electric commercial vehicle, which has six gear driving modes, and comprises the following steps:

1. i gear drive mode

When the first, fourth and fifth shifters 13, 35 and 44 are released, the second and third shifters 17 and 26 are closed, i.e., the first, fourth and fifth shift plates 12, 34 and 43 are in a free-rotating state, the second and third shift plates 16 and 25 are in a braked state, and further, the first, third and fifth shift gears 10, 32 and 41 are in a free-rotating state, the first, fourth and fifth ring gears 5, 28 and 39 are in a free-rotating state, the second and third shift gears 14 and 23 are in a braked mode, the second and third rotating arms 7 and 22 are in a locked state, and the six-speed automatic transmission for a pure electric vehicle is in an I-gear driving mode. The input shaft 1 obtains power from a driving motor and transmits the power to the first sun gear 2, the first sun gear 2 transmits part of the power to the first rotating arm 4 through the first planet gears 3, and the other part of the power is transmitted to the first gear ring 5, and the first gear ring 5 transmits the power to the second planet gears 6 through the outer gear ring and the second planet gears 6 transmit the power to the second gear ring 8 because the second rotating arm 7 is in a locking state; the first rotating arm 4 and the second gear ring 8 transmit the power to the intermediate shaft 19 after superposing the power on the connecting disc 18, and the intermediate shaft 19 transmits the power to the third sun gear 20 and the fourth rotating arm 30; since the third ring gear 22 is in the locked state, a part of the power from the land 18 is transmitted from the third sun gear 20 to the third rotating arm 27 via the third planetary gear 21, the third rotating arm 27 transmits the power to the fourth ring gear 28, and the fourth ring gear 28 transmits the power to the fourth planetary gear 29; a further part of the power from the connection disc 18 is transmitted by the fourth swivel arm 30 to the fourth planet wheel 29; the fourth sun gear 31 transmits the power from the third sun gear 20 and the fourth rotating arm 30 to the output shaft 40 after superimposing them.

The I gear speed ratio is as follows:

wherein: z1 represents the number of teeth of the first sun gear 2; z2 represents the number of teeth of the ring gear of the first ring gear 5; z3 represents the number of teeth of the outer ring gear of the first ring gear 5; z4 represents the number of teeth of the ring gear of the second ring gear 8; z5 represents the number of teeth of the third sun gear 20; z6 represents the number of teeth of the ring gear of the third ring gear 23; z7 represents the number of teeth of the fourth sun gear 31; z8 represents the number of teeth of the ring gear of the fourth ring gear 28; z9 represents the number of teeth of the fifth sun gear 37; z10 represents the number of teeth of the ring gear of the fifth ring gear 39; n1 represents the rotational speed of the input shaft 1; n2 represents the rotational speed of the output shaft 40.

2. II gear drive mode

When the second, fourth and fifth shifters 17, 35 and 44 are released, the first and third shifters 13 and 26 are closed, i.e., the second, fourth and fifth shift plates 16, 34 and 43 are in a free-turning state, the first, third and third shift plates 12 and 25 are in a braked state, and further, the second, fourth and fifth shift gears 14, 32 and 41 are in a free-turning state, the second, fourth and fifth rotating arms 7, 28 and 39 are in a free-turning state, the first and third shift gears 10 and 23 are in a braked state, the first and third ring gears 5 and 22 are in a locked state, and the six-speed automatic transmission for electric vehicles is in a II drive mode. The input shaft 1 obtains power from a driving motor and transmits the power to the first sun gear 2, and the first sun gear 2 transmits the power from the first planet gears 3 to the first rotating arms 4 and the first rotating arms 4 transmit the power to the intermediate shaft 19 through the connecting disc 18 because the first gear ring 5 is in a locking state; the intermediate shaft 19 transmits power to the third sun gear 20 and the fourth rotating arm 30; since the third ring gear 22 is in the locked state, a part of the power from the land 18 is transmitted from the third sun gear 20 to the third rotating arm 27 via the third planetary gear 21, the third rotating arm 27 transmits the power to the fourth ring gear 28, and the fourth ring gear 28 transmits the power to the fourth planetary gear 29; a further part of the power from the connection disc 18 is transmitted by the fourth swivel arm 30 to the fourth planet wheel 29; the fourth sun gear 31 transmits the power from the third sun gear 20 and the fourth rotating arm 30 to the output shaft 40 after superimposing them.

The II gear speed ratio is as follows:

3. III drive mode

When the first, third and fourth shifters 13, 26 and 35 are released, the second and fifth shifters 17 and 44 are closed, i.e., the first, third and fourth shift plates 12, 25 and 34 are in a free-rotating state, the second and fifth shift plates 16 and 43 are in a braked state, and further, the first, third and fourth shift gears 10, 23 and 32 are in a free-rotating state, the first, third and fourth ring gears 5, 22 and 28 are in a free-rotating state, the second and fifth shift gears 14 and 41 are in a braked state, the second and fifth rotating arms 7 and 39 are in a locked state, and the six-speed automatic transmission for a pure electric vehicle is in a III-gear drive mode; the input shaft 1 obtains power from a driving motor and transmits the power to the first sun gear 2, the first sun gear 2 transmits part of the power to the first rotating arm 4 through the first planet gears 3, and the other part of the power is transmitted to the first gear ring 5, and the first gear ring 5 transmits the power to the second planet gears 6 through the outer gear ring and the second planet gears 6 transmit the power to the second gear ring 8 because the second rotating arm 7 is in a locking state; the first rotating arm 4 and the second gear ring 8 transmit the power to the intermediate shaft 19 after superposing the power on the connecting disc 18, and the intermediate shaft 19 transmits the power to the third sun gear 20 and the fourth rotating arm 30; the fourth rotating arm 30 transmits power to the fourth planetary gear 29, the fourth planetary gear 29 transmits a part of power to the fourth sun gear 31, another part of power to the fourth gear ring 28, the fourth gear ring 28 transmits power to the fifth rotating arm 36, the fifth rotating arm 36 transmits power to the fifth planetary gear 38 due to the fifth gear ring 39 being in a locked state, and the fifth planetary gear 38 transmits power to the fifth sun gear 37; the fourth sun gear 31 and the fifth sun gear 37 transmit the power from the intermediate shaft 19 to the output shaft 40 after being superimposed.

The III gear speed ratio is as follows:

4. IV gear drive mode

When the second shifter 17, the third shifter 26, and the fourth shifter 35 are released, the first shifter 13 and the fifth shifter 44 are closed, i.e., the second shift plate 16, the third shift plate 25, and the fourth shift plate 34 are in a free-rotating state, the first shift plate 12 and the fifth shift plate 43 are in a braked state, and further, the second shift gear 14, the third shift gear 23, and the fourth shift gear 32 are in a free-rotating state, the second rotating arm 7, the third ring gear 22, and the fourth ring gear 28 are in a free-rotating state, the first shift gear 10 and the fifth shift gear 41 are in a braked state, the first ring gear 5 and the fifth ring gear 39 are in a locked state, and the six-speed automatic transmission for a pure electric vehicle is in an IV-gear drive mode; the input shaft 1 obtains power from a driving motor and transmits the power to the first sun gear 2, and the first sun gear 2 transmits the power from the first planet gears 3 to the first rotating arms 4 and the first rotating arms 4 transmit the power to the intermediate shaft 19 through the connecting disc 18 because the first gear ring 5 is in a locking state; the intermediate shaft 19 transmits power to the third sun gear 20 and the fourth rotating arm 30; the fourth rotating arm 30 transmits power to the fourth planetary gear 29, the fourth planetary gear 29 transmits a part of power to the fourth sun gear 31, another part of power to the fourth gear ring 28, the fourth gear ring 28 transmits power to the fifth rotating arm 36, the fifth rotating arm 36 transmits power to the fifth planetary gear 38 due to the fifth gear ring 39 being in a locked state, and the fifth planetary gear 38 transmits power to the fifth sun gear 37; the fourth sun gear 31 and the fifth sun gear 37 transmit the power from the intermediate shaft 19 to the output shaft 40 after being superimposed.

The IV gear speed ratio is as follows:

5. v gear driving mode

When the first, third and fifth shifters 13, 26 and 44 are released, the second and fourth shifters 17 and 35 are closed, i.e., the first, third and fifth shift plates 12, 25 and 43 are in a free-rotating state, the second and fourth shift plates 16 and 34 are in a braked state, and further, the first, third and fifth shift gears 10, 23 and 41 are in a free-rotating state, the first, third and fifth ring gears 5, 22 and 39 are in a free-rotating state, the second and fourth shift gears 14 and 32 are in a braked state, the second and fourth rotating arms 7 and 28 are in a locked state, and the six-speed automatic transmission for a pure electric vehicle is in a V-gear driving mode; the input shaft 1 obtains power from a driving motor and transmits the power to the first sun gear 2, the first sun gear 2 transmits part of the power to the first rotating arm 4 through the first planet gears 3, and the other part of the power is transmitted to the first gear ring 5, and the first gear ring 5 transmits the power to the second planet gears 6 through the outer gear ring and the second planet gears 6 transmit the power to the second gear ring 8 because the second rotating arm 7 is in a locking state; the first rotating arm 4 and the second gear ring 8 transmit the power to the intermediate shaft 19 after superposing the power on the connecting disc 18, and the intermediate shaft 19 transmits the power to the third sun gear 20 and the fourth rotating arm 30; the fourth rotating arm 30 transmits power to the fourth planetary gear 29, and since the fourth ring gear 28 is in the locked state, the fourth planetary gear 29 transmits power to the fourth sun gear 31, and the fourth sun gear 31 transmits power to the output shaft 40.

The V gear speed ratio is as follows:

6. VI speed drive mode

When the second, third and fifth shifters 17, 26 and 44 are released, the first and fourth shifters 13 and 35 are closed, i.e., the second, third and fifth shift plates 16, 25 and 43 are in a free-rotating state, the first, third and fifth shift plates 12 and 34 are in a braked state, the second, third and fifth shift gears 14, 23 and 41 are in a free-rotating state, the first, fourth shift gears 10 and 32 are in a braked state, and further, the second, third and fifth rotating arms 7, 22 and 39 are in a free-rotating state, the first and fourth ring gears 5 and 28 are in a locked state, and the six-speed automatic transmission for a pure electric vehicle is in a VI shift drive mode. The input shaft 1 obtains power from a driving motor and transmits the power to the first sun gear 2, and the first sun gear 2 transmits the power from the first planet gears 3 to the first rotating arms 4 and the first rotating arms 4 transmit the power to the intermediate shaft 19 through the connecting disc 18 because the first gear ring 5 is in a locking state; the intermediate shaft 19 transmits power to the third sun gear 20 and the fourth rotating arm 30; the fourth rotating arm 30 transmits power to the fourth planetary gear 29, and since the fourth ring gear 28 is in the locked state, the fourth planetary gear 29 transmits power to the fourth sun gear 31, and the fourth sun gear 31 transmits power to the output shaft 40.

The VI gear speed ratio is as follows:

the foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (1)

1. The six-speed automatic transmission for the pure electric commercial vehicle comprises a front two-speed compound planetary transmission device, a rear three-speed compound planetary transmission device and at least five groups of gear shifting modules; the front two-speed compound planetary transmission device and the rear three-speed compound planetary transmission device are sequentially and coaxially connected;

the gear shifting module comprises a gear shifting gear, a gear shifting shaft, a gear shifting disc and a gear shifter;

the gear shifting module is meshed with each gear control part of the corresponding front two-speed compound planetary transmission device and the corresponding rear three-speed compound planetary transmission device through a gear shifting gear;

the front two-speed compound planetary transmission device consists of a first sun gear, a first planet gear, a first gear ring, a first rotating arm, a second planet gear, a second gear ring and a second rotating arm, wherein the first sun gear is externally meshed with the first planet gear, the first gear ring is simultaneously provided with an inner gear ring and an outer gear ring on the inner circumference and the outer circumference, the first planet gear is internally meshed with the inner gear ring of the first gear ring, and the first planet gear is arranged on the first rotating arm; the second planet wheel is externally meshed with the outer gear ring of the first gear ring, the second gear ring is only provided with an inner gear ring, the second planet wheel is internally meshed with the second gear ring, and the second planet wheel is arranged on the second rotating arm;

the input shaft is fixedly connected with the first sun gear, the first rotating arm is fixedly connected with the second gear ring through a connecting disc, and the connecting disc is fixedly connected with the intermediate shaft; the two first gear shifting gears are symmetrically arranged on the outer circumference of the first gear ring, the first gear shifting gears are externally meshed with the outer gear ring of the first gear ring, the first gear shifting gears are fixedly connected with a first gear shifting disc through a first gear shifting shaft, and the first gear shifting disc is arranged between left and right friction blocks of the first gear shifter according to a certain gap; the second rotating arm is provided with second rotating arm gears, two second gear shifting gears are symmetrically arranged on the outer circumference of the second rotating arm gears, the second gear shifting gears are externally meshed with the second rotating arm gears, the second gear shifting gears are fixedly connected with a second gear shifting disc through second gear shifting shafts, and the second gear shifting disc is arranged between left and right friction blocks of a second gear shifter according to a certain gap;

the rear three-speed compound planetary transmission device consists of a third sun gear, a third planet gear, a third gear ring, a third rotating arm, a fourth sun gear, a fourth planet gear, a fourth gear ring, a fourth rotating arm, a fifth sun gear, a fifth planet gear, a fifth gear ring and a fifth rotating arm, wherein the third sun gear is externally meshed with the third planet gear, an inner gear ring and an outer gear ring are simultaneously processed on the inner circumference and the outer circumference of the third gear ring, the third planet gear is internally meshed with the inner gear ring of the third gear ring, and the third planet gear is arranged on the third rotating arm; the fourth sun gear is externally meshed with a fourth planetary gear, an inner gear ring and an outer gear ring are simultaneously processed on the inner circumference and the outer circumference of the fourth gear ring, the fourth planetary gear is internally meshed with the inner gear ring of the fourth gear ring, and the fourth planetary gear is arranged on a fourth rotating arm; the fifth sun gear is externally meshed with a fifth planetary gear, an inner gear ring and an outer gear ring are simultaneously processed on the inner circumference and the outer circumference of the fifth gear ring, the fifth planetary gear is internally meshed with the inner gear ring of the fifth gear ring, and the fifth planetary gear is arranged on a fifth rotating arm;

the third sun gear and the fourth rotating arm are sequentially and fixedly arranged on the intermediate shaft; the third rotating arm is fixedly connected with the fourth gear ring and the fifth rotating arm in sequence; the fourth sun gear and the fifth sun gear are sequentially and fixedly connected with the output shaft; the two third gear shifting gears are symmetrically arranged on the outer circumference of the third gear ring, the third gear shifting gears are externally meshed with the outer gear ring of the third gear ring, the third gear shifting gears are fixedly connected with a third gear shifting disc through third gear shifting shafts, and the third gear shifting disc is arranged between left and right friction blocks of a third gear shifter according to a certain gap; the two fourth gear shifting gears are symmetrically arranged on the outer circumference of the fourth gear ring, the fourth gear shifting gears are externally meshed with the outer gear ring of the fourth gear ring, the fourth gear shifting gears are fixedly connected with a fourth gear shifting disc through fourth gear shifting shafts, and the fourth gear shifting disc is arranged between left and right friction blocks of a fourth gear shifter according to a certain gap; the two fifth gear shifting gears are symmetrically distributed on the outer circumference of the fifth gear ring, the fifth gear shifting gears are externally meshed with the outer gear ring of the fifth gear ring, the fifth gear shifting gears are fixedly connected with a fifth gear shifting disc through fifth gear shifting shafts, and the fifth gear shifting disc is arranged between left and right friction blocks of the fifth gear shifter according to a certain gap.